Brake



March 22, 1932. J. BLACK BRAKE Sheets-Sheet l Filed Dec f 22, 1928 Zeefao- March 22, 1932. J BLACK 1,850,912

l BRAKE l Filed Dec. 22, 1928 2 sheets-sheet 2 Z5 r zj.

: ZZ l |r i A 5] I' "Tl-'. 46

1:. e /frl' I i 35 2 /6 Q emma! f jfuNif'r-ED STATES; PATENT orifice): f

i mana.V BLACK, or BriaUMoNnmxs Patented Mar. 22, 1932 BRAKE j Application mea member 22,1528, .seiiai' no. 327,859.5

This invention relates to brakes, and more Y particularly to equalized f brake mechanismy for use in conjunction yvithgthe dranT Works of rotary Welldrilling apparatus.

An important objectof the invention is the provisionV in 'apparatusof this character 'of a mounting for the brake such that the brake is aligned with the draw Works and properly positioned with relation thereto by' attachments 4to the salme'beams or supports upon which the dra-W Works foundations''arevr mounted and the brake apparatus is' a unit andvmayfbefinstalled orshipped as such. p A further and more 'important object of the invention is to provide equalizermech'a- 'band to such nism .eliminating the danger: of complete inevent-'of breakage of one of thev operation in brake bands or its connections to the operating mechanism vor in event of slacking of the a Vextent that a `grip upon the drum cannot sibly excessive movementl of the operating mechanism. j

A still furtherv object of the invention is to `provide equalized brake 'mechanism-for apparatus of this character which` is so constructed that the drum is' substantially completely embraced, thereby eliminating, the Waste Vbraking surface present in all types of lbraking apparatus of this'character With Which I am familiar. Y

A still further object ofthe'invention is toprovide a device ofl this character which .may be very readily adjustable to compensate for Wearl and in vvhich separation of the braking element from the drum, when the braking element is released, is insuredand Vmade uniform about the periphery of the drum.V

These and other objects I attain bythe construction shown in the accompanying drawings, wherein for the purpose of illustraltion is shown a preferred-embodiment of my invention andwherein Y Figure l isa fragmentary end elevation of the draw VWorks of rotary Well drilling ap` paratus showing brake mechanism constructed in `accordance with my invention applied thereto, parts being shown in section and parts being broken away;

Figure?, is` a plan-view of the be secured Without anV imposj,

brake mecha nism, the connections for the: brake bands being illustrated in position at one end ofthe i mechanism' and the positionsV 'of the drum flanges beingV illustrated in dotted lines;` i 'Figure '3 is a' transverse sectional `viev'pT illustrating the connections of the operating l shaft and .equalizer bar. V 3

Figure 4 is` a partial section on the line 4 4 of Figure' 2. v

'Referring now more particularly to 'the drawings,-the numeralv 10 generally desig-y nates a Hoor beam or sill vof a rotary. rig and more particularly that'jsill to Which the -up-j L rights y1l of the draw Works, generallydesignated at 12, are secured." These-draw Works include'a druinl, the ends of Which' have brake flanges 14 grooved, as at 152for thereception -of a brakeV band' 16; I The bands-'16 must be simultaneouslyopera/ted -to engage the drum and'it will, :of course.,` bef under*` stood that due to'l differences in the finish of drumfaces and other causes, the braking surl face V17 ofy such bands will Wear at different speeds, VWith thefresult that the bandsmust be adjusted or else improper braking action Will occur, To e'liminate'this adjustment,

dangerous, y the connections of the mechanism to the band' at one end-of the drum break, the entire mechequalizerl mechanisms 'have been provided, j but such mechanisms are, in-many instances,

`in that Vshould either vthe band or anism becomesV inoperative,` and there is Bolts 21 orth'eI like are employed to secure these flanges to the sill'to maintain the'plate in position after it has been properly longitudinally y'adjusted,as Will hereinafter be` rendered obvious. f t

The plate, for reasons hereinafter explained, isformed in a main section 2 2 and auxiliary sections 23 bolted to the main section at the ends thereof, as indicated at 24, and bearing the flanges 20. At its opposite ends and at what might be termed its front edge, the plate is provided with pairs of bearings 25 receiving opposite ends of a longitudinally extending operating shaft 26. This shaft is held against longitudinal movement by means of collars 27 orthe like and at its center has secured thereto an arm 28, the outer end of which is furcate and has the arms 29 thereof bridged by a pivot pin 30. One end of this shaft has an operating lever 31 corresponding to the ordinary brake lever of such apparatus.

Mounted upon the pin 30 is a link 32, the opposite end of which engages a horizontal pin 33 vcarried by a longitudinally extending equalizing bar 34. The connections of the link 32 to the pins 30, 33 are sufficiently loose toV permit oscillation of the equalizing bar within the necessary limits. These bars, adjacent their ends, pass through eyes 35 constructed to prevent vertical elevation of the bar while permitting a limited shifting movement of the bar transversely of the plate. The extreme ends of the bar have rearwardly directed apertured ears receiving horizontal pivot pins 36. Immediately rearwardly of the bearings 25 are pairs of spaced apertured ears 37 receiving the ends of securing and pivot `pins 38 upon which are mounted brake band clips 39 to which the fixed ends of the bands 16 are secured. 'Ihe opposite ends of the bands have clips 4() provided with lugs 41 having a bore 42 extending in the general direction of the band. Withinthese lugs are rotatably mounted nuts 43 which project at the rear ends of the lugs and are squared, as at 44, for arrangement by a wrench.

Directed through the nuts are eye bolts 45, the eyes 46 of which are received by the pins 36. Lock nuts 47 engage opposite ends of the nuts 44 to secure adjusted positions of the eye bolts and these eye bolts in their engagement with the pins 36 have sufhcient play to admit of the oscillary movements of the equalizer bar 34. In installation of a device of this character, the main plate 22 is separated from the plates 23 and the clips 40 are disengaged from the eye bolts. The entire main plate 22 with the bands carried thereby canthen be inserted from the forward side of the draw works to proper position beneath the drum, when the plates 23 may be secured thereto and then the entire assemblage bolted in position. In securing this position, as hereinbefore set forth, the transverse position-is. determined by the flanges 20 and the longitudinal position may very readily be determined by passing the bands about the drums inthe grooves 15 thereof and connect- Ving them to their respective eye bolts, so that the assemblage is properly longitudinally positioned.

In operation of the device, a pull upon the lever 31 will be transmitted to the equalizer bar 34 and thereby to the movable ends of the brake bands, shifting them toward the fixed ends thereof. In event the movement at either end is excessive, the bar 34 engaging the forward wall of the yoke 35 will provide a xed pivotagainst which the link 22 may shift the bar to insure tightening of the band which is still in an operative condition. Therefore, if either of these bands break, the other band is still effective.

In restoring the bands to their released posit-ion. if either of the bands tend to stick, the bar 34 adjacent the opposite end thereof from that at which-the bands sticks will engage the forward wall of the associated yoke, again providing a fixed pivot about which the bar may be swung to insure release of the stuck band. In addition to performing the functions just described, these yokes serve to guide the bar in its movements and eliminate waste motion in the braking or releasing operations.

In combination with structure of this character, I provide front and rearward band stops 48 and 49 which are associated with the fixed and movable ends of each brake band respectively. Each stop comprises an attaching bracket 50 and an arcuately curved portion 51 confronting the outer face of the band and through which are extended adjustable set or stop screws 52. In releasing movements of the band. the movable end of the band, during initial disengagement, will. of course, be first shifted outwardly this shifting movement will result in its engagement by the set-screws 52 of the associated curved portion 51. ts outward movement thus limited, a further movement of its clip will cause a disengaging movement further about the periphery of the drum. The supports extend to points approximately 120 spaced about the bottom of the drum surface, with the result that the band, when in expanded condition. is squeezed between two braces, so that the upper portion thereof is held in properly spaced relation to the drum and does not drag thereon. If, at any time, a band becomes worn to such an extent that an adjustment is necessary,this is readily accomplished by simply rotating the nut 43 thereof.

Attention is directed to the fact that with a construction of this character, the adjacent ends of the bands closely approach one another, so that the waste or unused braking surface which, in most devices of this character, constitutes practically one-fourth of the available surface, is reduced substantially to a zero point.

Since the construction hereinbefore set forth is capable of a certain range of change which. opposite .ends of the bar pass,v saidV ends of the brake bands, an arm secured to 251 movement ofthe bar in either direction, each] the Shaftna1gnment-wth thecenter of, the' 35to said flanges, means for securing thel plate'v Lamiera limit'myselffto; such specific structureq'except, y

asghereinafter claimed.

I cla1mf :-l 1.

l; In equaliz'ed' brakev mechanismyfor the;

drums ofv rotary drilling draw works and the like, and in combination with a drumrhaving brake Vflanges at its opposite ends, a supporting plate; extending'longitudinally vof the drum and havingits ends in close proximity toisai'dflan'ges, means for securing the plate to a support, brake bands each secured at opposite endsof ltheplate andin alignmentwith 15? thev adjacent brake flange, a bar extending longitudinally and shiftable'transversely of the plate, connections between the opposite ends ofLV said barand the opposite ends nof said-brake bands, and means mountedy upon 1 said plate forpshifting said bar transversely of thierplatepermitting pivotal 4movements of. theY bar,- .saidplateV having yokes through yokes ,each ,providing positive,` limits Y' for yoke providing a fulcrumI againstjwhich the bar-may rockin case ofthe breakage or loosen.

ingof oneofthe brake bands. s

2. In equalized brake'mechanism-forthe Qdrfums of-rotaryvdrilling draw` works and the like, Vand in combination lwitha drum having brake flanges atits opposite. ends, Va support Y ing platenextending,'.longitudinally 0f the drum and havingv its ends in close proximity to a support, brakebands, each extending over a drumflange and secured to the plate atone end, a bar V extending longitudinally andshiftable transverselyfof7 vthe plate, connec-r tions between the oppositeends of said bar,

andthe opposite ends of said brake bands,

and means mounted uponfthe plate for shifting said bar' transversely of the plate permitting pivotal movements of the bar, said 5f-plate having yokes through which opposite ends ofthebar pass, said yokes each providing positive-stops limiting the movement ofthe bai' in either direction and constituting fulcrums for said bar andsaid yokesv preimventing separation of the bar and plate.

3. In equalizedbrake mechanism for ,the-

drilling .draw worksy and the drums of rotary like,` and in combination with a drum having brake flanges Vat its opposite ends, a plate lextending longitudinallyof vthe drumy and having'its ends in close proximity to said flanges, means forsecuring the plate to ak support,` aligned bearings atl oppositev ends Hof the plate, a rock shaftamounted therein,. 69-a brake band clip pivoted adjacent each bear- Y ing and adapted for connection to one end of la band encircling the associated flange, a-'bar slidable uponv the plate, bolts'y pivotallycon'- nected with opposite ends of the bar, brake fband Vclips :adjustable)longitudinally ofA said bolts land adapted for engagement with the opposite endsof the bakebands, an arm ser` cured tol the'sha-ft in alignment with the centerof the bar, and a link connection betweening its ends in close proximity toY said flanges, l

means for securing ,thel plate to aj support,

aligned bearings at opposite ends'ofv the plate,

a. rock Vshaft mounted there-im, a 4brake band clip pivot'ed adjacent each'bearing and adapted for connection toone endof a band-encircling the associated 4flange,.a bar slidable upon the plate, bolts pivotallyconnected with opposite ends .of the Ibar,brake bandl clips adjustable longitudinally o'fsaid bolts and adaptedfor engagement with thev opposite bar,v a link connection between: the bar: and

said arm permitting pivotal movements lof;- the bar in a plane paralleling the-plate,;and means maintaining 'the-,bar in engagement with-thevplate. l Y i n 4 l 5. In vequalized brake. mechanism -forlthe drums of rotary drilling ldraw works `andthe like,and in combination with a drum having-v brake flanges at itsy opposite ends,a platey extending longitudinally of thedrum andhaving its ends inclose proximity togsaid flangesmean`s fonsecuring-the vplate [to a support, alignedbearings aia-opposite end-s of` the pl-ate, a rock shaft mountedtherein, a- J brakeband clip pivotedadjacent eachA bearing and adapted for connection to one end of a banda encircling the associatedv flange, Va

lOf-Si bar slidableinpon thepl-ate, bolts fpivotally movements of the bar in` a plane-paralleling the plate, and means maintaining the bar in connectedV withfopposite ends- 0f the -bar,`

brake band1clips adjustable longitudinally of 11H21' Y engagement with the plate and limiting move- 1 ment-of oppyf` sitev-ends ofthe barin 7either direction.` Y

6.5111 equalized lbrakel mechanismfor the i drums.ofrotary-drilling draw-Works and the like-,andin'combination with a drumvhavingy f bnakeflanges at its oppositeends, a plate'extendinglongitudinally of the drum and hav`k j,

ing its ends in close proximity-to lsaid flanges,

aligned bearings at opposite ends of thel plate,

clip pivoted 'adjacent each bearing andfadapt- "meanszfor securing the'` plateto arsupport, Y

ed for connection to one end of a band encircling the associated flange, a bar slidable upon the plate, bolts pivotally connected with opposite ends of the bar, brake band clips adjustable longitudinally of said bolts and adapted for engagement with the opposite ends of the brake bands, an arm secured to the shaft in alignment with the center of the bar, a link connection between the bar and said arm permitting pivotal movements of the bar in a pla-ne paralleling the plate, and yokes carried by the plate through which opposite ends of the bar are directed inclu-ding portions limiting` movement of the bar in either direction. v

7. In a draw works and in combination, a sill, a flooring supported from the sill, standards likewise supported from the sill, a drum supported from the standards in spaced relation to the flooring and having brake flanges at its opposite ends, a plate seated upon said flooring beneath the drum and having flanges engaging the sill to determine its transverse alignment with the drum, bands encircling the flanges of the drum, means anchoring corresponding ends of the bands to the plates, and an equalizer bar and operating mechanism therefor carried by said plate and connectedV to opposite ends of the bands, said flanges being detachably connected with the plate and the equalizeibar being detachably connected with the last named ends of the bands whereby upon removal of said flanges and release of the last named ends of the bands, the plate, bands and associated mechanism may be removed as a unit.

8. In a ldraw works, the combination of a drum having brake flanges at its opposite ends, brake bands engaging the brake flanges, means anchoring corresponding ends of said brake bands, an equalizing bar connected to the opposite ends of said brake bands, means for lshifting said equalizing bar to tighten or loosen the bands, and stops disposed inward of the ends of the bar acting to limit shifting movements of opposite ends of the bar in either direction and providing spaced fulcrnms against which one or the other of the ends of the bar will bear in the event ofV excessive looseness or breakage of one or the other of the bands.

9. In combination with a drum having brake flanges at its opposite ends, brake bands, means anchoring corresponding ends of said brake bands, an equalizer bar connected to the opposite ends of said brake bands, means connected to the equalizer bar to shift it to thereby tighten or loosen the bands, and yokes disposed inward of the ends of the bands and through which the bar passes, said yokes limiting the forward and rearward movement of the bar and also acting as fulcrums in case one or the other of the brake bands becomes excessively loosened or breaks.

10. In combination with a drum having brake flanges at its opposite ends, brake bands surrounding the flanges, means anchoring corresponding ends of said brake bands, an equalizer bar connected to the opposite ends of said brake bands, means for shifting the equalizer bar to tighten or loosen the bands, and elements limiting the rearward movement of the bar and disposed adjacent the ends thereof and against which the edge of the bar bears when the bar is fully retracted, said elements in case one or the other of the bands becomes loosened or breaks, acting as fulcrums as and for the purpose stated.

l1.A A' brake band supporting unit for use with a drum having brake flanges and brake bands surrounding the flanges, the unit comprising a plate having a depending flange at its real` edge, the plate and flange being adapted to engage upon and against a sill, said plate having portions projecting in either direction and carryingbearings, a brake actuating shaft mounted upon said bearings,

means mounted upon said plate adjacent said bearings for engaging one end of each of the brake bands, an equalizer bar disposed upon said plate, and having means whereby it may be operatively connected to the other Y end of each brake band, the shaft having an arm, a link connecting said arm to the equalizer bar, the plate having yokes extending over the bar and permitting a limited movement of the bar and holding the bar to the pla-te, members mounted at opposite ends of the plate beyond said brake band engaging meansV on the bar and plate, said-members extending upwardly approximately concentric to the brake flanges and brake bands, said members having adjustable means extending through them for engaging the outer surfaces of the brake bands forward and rearward of vthe drum to thus support the brake bands in concentric relation to the brake flanges.

l2. In a draw works, a drum having a brake flange, a band brake extending around said flange, the two ends of the brake being disposed substantially in alinement with each other beneath the drum, means for anchoring one end of the brake band, the free end of the brake band having an eye disposed in approximately horizontal alinement with said anchoring means, a brake lever having an arm` an operative connection between the arm and the eye including a bolt operatively engaged with the arm and extending through the eye and a nut on opposite ends of the eye and'engaging said bolt whereby the free end of the brake band may be adjusted.

13. Inv a draw works` a drum, a brake flange, a brake band extending around the flange, a plate disposed beneath the drum,

lmeans for anchoring one end of the brake band to said plate, a shaft mounted upon the plate and having anl arm, a link extending from the arm and operatively connected Yto the free end of the brake band, and front and rear band stops, associated with the xed and movable ends of the brake band, said stops limiting the downward movement of the brake band with reference to the drum when the brake band is released to thus hold the upper portion of the' brake band'inspaced relation to the drum when the brake band is released. i

In testimony whereof I aix my signature.

LEE J. BLACK. 

